Ford 1997 Aerostar Manual page 253

Front wheel bearings require periodic repacking
and adjustment as specified in the Maintenance
Schedule booklet. Loose or worn front wheel
bearings tend to let the vehicle wander or
shimmy, and can eventually cause excessive tire
wear.
Whenever a wheel is removed and then
re-installed, always remove any corrosion that
may be present on the mounting surface of the
wheel and/or the surface of the hub, drum or
rotor that contacts the wheel.
Installing wheels without a good
metal-to-metal contact at the wheel
mounting surface can cause the wheel lug
nuts to loosen and could allow the wheel
to come off while the vehicle is in motion.
On-vehicle wheel balancing will cause
damage to the drivetrain of E-4WD
Aerostars.
Traction-Lok Rear Axle
(If equipped)
This axle provides added drive away traction on
slippery surfaces, particularly when one or more
wheels are on a surface with poor traction.
To avoid injury, never run the engine
with one wheel off the ground, such as
when changing a tire.
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